! Function for noise

!function f(x)		! (x-1)^3
!f =-1. +3*x -3*x*x +x*x*x
!end

!function f(x)		! (x-1.21)^3
!f =x**3 -3.63*x*x +4.3923*x -1.771561
!end

function f(x)		! (x-1.2)^3
f =-1.728 +4.32*x -3.6*x*x +x*x*x
end



